Question 1

Standard TTL circuits operate with a volt power supply.
A)2
B)4
C)5
D)3

Accepted Answer

Standard TTL (Transistor-Transistor Logic) circuits operate with a 5-volt power supply.

Question 2

A TTL gate may operate inadvertently as an                          
A)digital amplifier
B)analog amplifier
C)inverter
D)regulator

Accepted Answer

TTL gates can operate inadvertently as analog amplifiers when they are not fully switched between their logic levels, allowing for the amplification of small analog signals.

Question 3

Which statement below best describes a Karnaugh map?
A)it is simply a rearranged truth table
B)the karnaugh map eliminates the need for using nand and nor gates
C)variable complements can be eliminated by using karnaugh maps
D)a karnaugh map can be used to replace boolean rules

Accepted Answer

A Karnaugh map is essentially a truth table that has been rearranged into a format that makes it easier to visualize and minimize logical expressions. It does not eliminate the need for NAND and NOR gates, eliminate variable complements, or replace Boolean rules but simplifies the process of minimizing Boolean expressions.

Question 4

Which of the examples below expresses the commutative law of multiplication?
A)a + b = b + a
B)a • b = b + a
C)a • (b • c) = (a • b) • c
D)a • b = b • a

Accepted Answer

The commutative law of multiplication states that changing the order of the factors does not change the product, which is correctly expressed as a • b = b • a.

Question 5

The Boolean expression Y = (AB)' is logically equivalent to what single gate?
A)nand
B)nor
C)and
D)or

Accepted Answer

The expression Y = (AB)' represents the NAND gate, which is the negation of the AND gate output.

Question 6

The systematic reduction of logic circuits is accomplished by:
A)symbolic reduction
B)ttl logic
C)using boolean algebra
D)using a truth table

Accepted Answer

Boolean algebra is used to simplify and reduce logic circuits by applying algebraic rules and theorems.

Question 7

Each "1" entry in a K-map square represents:
A)a high for each input truth table condition that produces a high output
B)a high output on the truth table for all low input combinations
C)a low output for all possible high input conditions
D)a don't care condition for all possible input truth table combinations

Accepted Answer

Each "1" entry in a K-map square represents a high for each input truth table condition that produces a high output, correlating the input conditions to their resulting output in a simplified visual form for Boolean function simplification.

Question 8

Each "0" entry in a K-map square represents:
A)a high for each input truth table condition that produces a high output
B)a high output on the truth table for all low input combinations
C)a low output for all possible high input conditions
D)a don't care condition for all possible input truth table combinations

Accepted Answer

The answer of Each "0" entry in a K-map square...

Question 9

Looping on a K-map always results in the elimination of                      
A)variables within the loop that appear only in their complemented form
B)variables that remain unchanged within the loop
C)variables within the loop that appear in both complemented and uncomplemented form
D)variables within the loop that appear only in their uncomplemented form

Accepted Answer

Looping on a K-map eliminates variables that appear in both their complemented and uncomplemented forms within the loop, because the purpose of the loop is to simplify the expression by identifying commonalities, and a variable that changes state (from true to complemented, or vice versa) does not affect the outcome of the looped expression.

Question 10

Which of the following expressions is in the sum-of-products form?
A)(a + b)(c + d)
B)(a * b)(c * d)
C)a* b *(cd)
D)a * b + c * d

Accepted Answer

The sum-of-products form consists of two or more products that are summed together. Option D, a * b + c * d, fits this description as it is a sum (indicated by the + sign) of two products (a*b and c*d).

Question 11

What is an ambiguous condition in a NAND based S'-R' latch?
A)s'=0, r'=1
B)s'=1, r'=0
C)s'=1, r'=1
D)s'=0, r'=0

Accepted Answer

The ambiguous condition in a NAND based S'-R' latch occurs when both inputs, S' and R', are 0. This state is ambiguous because it can potentially force both outputs to be 1 simultaneously, which violates the basic principle of the latch where one output should be the complement of the other.

Question 12

In a NAND based S'-R' latch, if S'=1 & R'=1 then the state of the latch is
A)no change
B)set
C)reset
D)forbidden

Accepted Answer

When both S' and R' inputs are 1 in a NAND-based S'-R' latch, the latch remains in its previous state, meaning there is no change to its state. This is because the inputs do not actively drive the latch to set or reset.

Question 13

A NAND based S'-R' latch can be converted into S-R latch by placing                          
A)a d latch at each of its input
B)an inverter at each of its input
C)it can never be converted
D)both a d latch and an inverter at its input

Accepted Answer

The answer of A NAND based S'-R' latch can be...

Question 14

The difference between a flip-flop & latch is                          
A)both are same
B)flip-flop consist of an extra output
C)latches has one input but flip-flop has two
D)latch has two inputs but flip-flop has one

Accepted Answer

Latches and flip-flops are both types of bistable multivibrators in digital electronics, but they differ in how they change state. A latch changes state with the input signal level, while a flip-flop changes state on a clock edge. This means latches are level-triggered devices, and flip-flops are edge-triggered. The statement about the number of inputs is incorrect in the context of distinguishing between latches and flip-flops, as the key difference lies in how they are triggered, not necessarily in the number of inputs they have.

Question 15

How many types of flip-flops are?
A)2
B)3
C)4
D)5

Accepted Answer

There are 4 basic types of flip-flops: SR (Set-Reset), D (Data or Delay), JK (Jack Kilby), and T (Toggle).

Question 16

The S-R flip flop consist of                          
A)4 and gates
B)two additional and gates
C)an additional clock input
D)3 and gates

Accepted Answer

The S-R flip flop typically consists of two additional AND gates to control the set and reset conditions, along with the basic NOR or NAND gates that form the flip flop.

Question 17

What is one disadvantage of an S-R flip-flop?
A)it has no enable input
B)it has a race condition
C)it has no clock input
D)invalid state

Accepted Answer

An S-R flip-flop can enter an invalid state when both the Set and Reset inputs are high simultaneously, leading to unpredictable behavior.

Question 18

One example of the use of an S-R flip-flop is as                          
A)racer
B)stable oscillator
C)binary storage register
D)transition pulse generator

Accepted Answer

An S-R (Set-Reset) flip-flop is primarily used as a binary storage register. It stores a binary value (0 or 1) and maintains that state until it is changed by an input signal.

Question 19

When is a flip-flop said to be transparent?
A)when the q output is opposite the input
B)when the q output follows the input
C)when you can see through the ic packaging
D)when the q output is complementary of the input

Accepted Answer

A flip-flop is said to be transparent when the q output follows the input, meaning the output directly reflects the current input state.

Question 20

On a positive edge-triggered S-R flip-flop, the outputs reflect the input condition when
A)the clock pulse is low
B)the clock pulse is high
C)the clock pulse transitions from low to high
D)the clock pulse transitions from high to low

Accepted Answer

In a positive edge-triggered S-R flip-flop, the outputs change according to the inputs only when the clock pulse transitions from low to high, which is what defines the "positive edge-triggered" behavior.

Quiz 4: TTL Circuits, Karnaugh Maps, and Flip-Flops

Standard TTL circuits operate with a volt power supply.

A TTL gate may operate inadvertently as an

Which statement below best describes a Karnaugh map?

Which of the examples below expresses the commutative law of multiplication?

The Boolean expression Y = (AB) ' is logically equivalent to what single gate?

The systematic reduction of logic circuits is accomplished by:

Each "1" entry in a K-map square represents:

Each "0" entry in a K-map square represents:

Looping on a K-map always results in the elimination of

Which of the following expressions is in the sum-of-products form?

What is an ambiguous condition in a NAND based S'-R' latch?

In a NAND based S'-R' latch, if S'=1 & R'=1 then the state of the latch is

A NAND based S'-R' latch can be converted into S-R latch by placing

The difference between a flip-flop & latch is

How many types of flip-flops are?

The S-R flip flop consist of

What is one disadvantage of an S-R flip-flop?

One example of the use of an S-R flip-flop is as

When is a flip-flop said to be transparent?

On a positive edge-triggered S-R flip-flop, the outputs reflect the input condition when